South African showjumper Nicole Horwood riding MARK WHITE, Nissan’s Capital Don Cumarco have clinched the coveted title again this year in the South African Showjumping Derby. South African showjumper Nicole Horwood has once again proven that she is queen of the South African Showjumping Derby track, clinching the title for the fourth time in her career on her trusty steed, Capital Don Cumarco, today, October 2, in the Bob Charter Arena at Kyalami Equestrian Park. Nicole Horwood riding Capital Don Cumarco have clinched their fourth win in this year's South African Showjumping Derby.